In 2002, before the birth of our son, I bought a well-preserved 850er, with 2.5 L 125 Kw and three years later converted to LPG. Everything wonderful, except for the fact that the indicator for the engine control went on, demand with the retrofitter, lights would be ́no problem, the car drives well. This year on summer holidays ! went off, the car reacts and hangs not properly on the gas.No power, exhaust totally tight, Kat and the two lambda probes changed, car drives is a After a few days, the problem started again, the car is not well connected to the gas, LPG operation is much better, but this condition is of course no solution. Go to the friendly and let the car read out with the diagnostic device, several fault points, point to air mass meters. Got me an LMM ( no original goods ) and replaced, the old one was indeed the glow wire. Problem in petrol operation: stuttering, re The problems seem to disappear when switching to the LPG operation, who knows. My question, do I have to reset the LMM, do only the original LMM, or could this described problem also have other causes. Motor is ok according to the car repair shop. Does someone know a reliable car mechanic in the vicinity of Cologne, who is well acquainted with Volvo? Slowly I really lose my faith, especially a Swede, because I would be very happy about an answer, Moose96